OMAPDSS: Add new DSI Command Mode panel driver

Add DSI Command Mode panel driver which uses the new DSS device model
and DSS ops. This driver only supports a very basic set of features
which should be common to all DSI command mode panels.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 1342 insertions, 0 deletions

diff --git a/drivers/video/omap2/displays-new/Kconfig b/drivers/video/omap2/displays-new/Kconfig
index cc62a7614f7f..efb72b352efd 100644
--- a/drivers/video/omap2/displays-new/Kconfig
+++ b/drivers/video/omap2/displays-new/Kconfig
@@ -33,4 +33,9 @@ config DISPLAY_PANEL_DPI
         help
           Driver for generic DPI panels.
 
+config DISPLAY_PANEL_DSI_CM
+        tristate "Generic DSI Command Mode Panel"
+        help
+          Driver for generic DSI command mode panels.
+
 endmenu
diff --git a/drivers/video/omap2/displays-new/Makefile b/drivers/video/omap2/displays-new/Makefile
index 45a8037b6909..557c48226296 100644
--- a/drivers/video/omap2/displays-new/Makefile
+++ b/drivers/video/omap2/displays-new/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_DISPLAY_CONNECTOR_DVI) += connector-dvi.o
 obj-$(CONFIG_DISPLAY_CONNECTOR_HDMI) += connector-hdmi.o
 obj-$(CONFIG_DISPLAY_CONNECTOR_ANALOG_TV) += connector-analog-tv.o
 obj-$(CONFIG_DISPLAY_PANEL_DPI) += panel-dpi.o
+obj-$(CONFIG_DISPLAY_PANEL_DSI_CM) += panel-dsi-cm.o
diff --git a/drivers/video/omap2/displays-new/panel-dsi-cm.c b/drivers/video/omap2/displays-new/panel-dsi-cm.c
new file mode 100644
index 000000000000..aaaea6469cd9
--- /dev/null
+++ b/drivers/video/omap2/displays-new/panel-dsi-cm.c
@@ -0,0 +1,1336 @@
+/*
+ * Generic DSI Command Mode panel driver
+ *
+ * Copyright (C) 2013 Texas Instruments
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+/* #define DEBUG */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <video/omapdss.h>
+#include <video/omap-panel-data.h>
+#include <video/mipi_display.h>
+
+/* DSI Virtual channel. Hardcoded for now. */
+#define TCH 0
+
+#define DCS_READ_NUM_ERRORS     0x05
+#define DCS_BRIGHTNESS          0x51
+#define DCS_CTRL_DISPLAY        0x53
+#define DCS_GET_ID1             0xda
+#define DCS_GET_ID2             0xdb
+#define DCS_GET_ID3             0xdc
+
+struct panel_drv_data {
+        struct omap_dss_device dssdev;
+        struct omap_dss_device *in;
+
+        struct omap_video_timings timings;
+
+        struct platform_device *pdev;
+
+        struct mutex lock;
+
+        struct backlight_device *bldev;
+
+        unsigned long   hw_guard_end;   /* next value of jiffies when we can
+                                         * issue the next sleep in/out command
+                                         */
+        unsigned long   hw_guard_wait;  /* max guard time in jiffies */
+
+        /* panel HW configuration from DT or platform data */
+        int reset_gpio;
+        int ext_te_gpio;
+
+        bool use_dsi_backlight;
+
+        struct omap_dsi_pin_config pin_config;
+
+        /* runtime variables */
+        bool enabled;
+
+        bool te_enabled;
+
+        atomic_t do_update;
+        int channel;
+
+        struct delayed_work te_timeout_work;
+
+        bool intro_printed;
+
+        struct workqueue_struct *workqueue;
+
+        bool ulps_enabled;
+        unsigned ulps_timeout;
+        struct delayed_work ulps_work;
+};
+
+#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
+
+static irqreturn_t dsicm_te_isr(int irq, void *data);
+static void dsicm_te_timeout_work_callback(struct work_struct *work);
+static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
+
+static int dsicm_panel_reset(struct panel_drv_data *ddata);
+
+static void dsicm_ulps_work(struct work_struct *work);
+
+static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
+{
+        ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
+        ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
+}
+
+static void hw_guard_wait(struct panel_drv_data *ddata)
+{
+        unsigned long wait = ddata->hw_guard_end - jiffies;
+
+        if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
+                set_current_state(TASK_UNINTERRUPTIBLE);
+                schedule_timeout(wait);
+        }
+}
+
+static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
+{
+        struct omap_dss_device *in = ddata->in;
+        int r;
+        u8 buf[1];
+
+        r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
+
+        if (r < 0)
+                return r;
+
+        *data = buf[0];
+
+        return 0;
+}
+
+static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
+{
+        struct omap_dss_device *in = ddata->in;
+        return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
+}
+
+static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
+{
+        struct omap_dss_device *in = ddata->in;
+        u8 buf[2] = { dcs_cmd, param };
+
+        return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
+}
+
+static int dsicm_sleep_in(struct panel_drv_data *ddata)
+
+{
+        struct omap_dss_device *in = ddata->in;
+        u8 cmd;
+        int r;
+
+        hw_guard_wait(ddata);
+
+        cmd = MIPI_DCS_ENTER_SLEEP_MODE;
+        r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
+        if (r)
+                return r;
+
+        hw_guard_start(ddata, 120);
+
+        usleep_range(5000, 10000);
+
+        return 0;
+}
+
+static int dsicm_sleep_out(struct panel_drv_data *ddata)
+{
+        int r;
+
+        hw_guard_wait(ddata);
+
+        r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
+        if (r)
+                return r;
+
+        hw_guard_start(ddata, 120);
+
+        usleep_range(5000, 10000);
+
+        return 0;
+}
+
+static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
+{
+        int r;
+
+        r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
+        if (r)
+                return r;
+        r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
+        if (r)
+                return r;
+        r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
+        if (r)
+                return r;
+
+        return 0;
+}
+
+static int dsicm_set_update_window(struct panel_drv_data *ddata,
+                u16 x, u16 y, u16 w, u16 h)
+{
+        struct omap_dss_device *in = ddata->in;
+        int r;
+        u16 x1 = x;
+        u16 x2 = x + w - 1;
+        u16 y1 = y;
+        u16 y2 = y + h - 1;
+
+        u8 buf[5];
+        buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
+        buf[1] = (x1 >> 8) & 0xff;
+        buf[2] = (x1 >> 0) & 0xff;
+        buf[3] = (x2 >> 8) & 0xff;
+        buf[4] = (x2 >> 0) & 0xff;
+
+        r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
+        if (r)
+                return r;
+
+        buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
+        buf[1] = (y1 >> 8) & 0xff;
+        buf[2] = (y1 >> 0) & 0xff;
+        buf[3] = (y2 >> 8) & 0xff;
+        buf[4] = (y2 >> 0) & 0xff;
+
+        r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
+        if (r)
+                return r;
+
+        in->ops.dsi->bta_sync(in, ddata->channel);
+
+        return r;
+}
+
+static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
+{
+        if (ddata->ulps_timeout > 0)
+                queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
+                                msecs_to_jiffies(ddata->ulps_timeout));
+}
+
+static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
+{
+        cancel_delayed_work(&ddata->ulps_work);
+}
+
+static int dsicm_enter_ulps(struct panel_drv_data *ddata)
+{
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        if (ddata->ulps_enabled)
+                return 0;
+
+        dsicm_cancel_ulps_work(ddata);
+
+        r = _dsicm_enable_te(ddata, false);
+        if (r)
+                goto err;
+
+        if (gpio_is_valid(ddata->ext_te_gpio))
+                disable_irq(gpio_to_irq(ddata->ext_te_gpio));
+
+        in->ops.dsi->disable(in, false, true);
+
+        ddata->ulps_enabled = true;
+
+        return 0;
+
+err:
+        dev_err(&ddata->pdev->dev, "enter ULPS failed");
+        dsicm_panel_reset(ddata);
+
+        ddata->ulps_enabled = false;
+
+        dsicm_queue_ulps_work(ddata);
+
+        return r;
+}
+
+static int dsicm_exit_ulps(struct panel_drv_data *ddata)
+{
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        if (!ddata->ulps_enabled)
+                return 0;
+
+        r = in->ops.dsi->enable(in);
+        if (r) {
+                dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
+                goto err1;
+        }
+
+        in->ops.dsi->enable_hs(in, ddata->channel, true);
+
+        r = _dsicm_enable_te(ddata, true);
+        if (r) {
+                dev_err(&ddata->pdev->dev, "failed to re-enable TE");
+                goto err2;
+        }
+
+        if (gpio_is_valid(ddata->ext_te_gpio))
+                enable_irq(gpio_to_irq(ddata->ext_te_gpio));
+
+        dsicm_queue_ulps_work(ddata);
+
+        ddata->ulps_enabled = false;
+
+        return 0;
+
+err2:
+        dev_err(&ddata->pdev->dev, "failed to exit ULPS");
+
+        r = dsicm_panel_reset(ddata);
+        if (!r) {
+                if (gpio_is_valid(ddata->ext_te_gpio))
+                        enable_irq(gpio_to_irq(ddata->ext_te_gpio));
+                ddata->ulps_enabled = false;
+        }
+err1:
+        dsicm_queue_ulps_work(ddata);
+
+        return r;
+}
+
+static int dsicm_wake_up(struct panel_drv_data *ddata)
+{
+        if (ddata->ulps_enabled)
+                return dsicm_exit_ulps(ddata);
+
+        dsicm_cancel_ulps_work(ddata);
+        dsicm_queue_ulps_work(ddata);
+        return 0;
+}
+
+static int dsicm_bl_update_status(struct backlight_device *dev)
+{
+        struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+        int level;
+
+        if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
+                        dev->props.power == FB_BLANK_UNBLANK)
+                level = dev->props.brightness;
+        else
+                level = 0;
+
+        dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
+
+        mutex_lock(&ddata->lock);
+
+        if (ddata->enabled) {
+                in->ops.dsi->bus_lock(in);
+
+                r = dsicm_wake_up(ddata);
+                if (!r)
+                        r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
+
+                in->ops.dsi->bus_unlock(in);
+        } else {
+                r = 0;
+        }
+
+        mutex_unlock(&ddata->lock);
+
+        return r;
+}
+
+static int dsicm_bl_get_intensity(struct backlight_device *dev)
+{
+        if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
+                        dev->props.power == FB_BLANK_UNBLANK)
+                return dev->props.brightness;
+
+        return 0;
+}
+
+static const struct backlight_ops dsicm_bl_ops = {
+        .get_brightness = dsicm_bl_get_intensity,
+        .update_status  = dsicm_bl_update_status,
+};
+
+static void dsicm_get_resolution(struct omap_dss_device *dssdev,
+                u16 *xres, u16 *yres)
+{
+        *xres = dssdev->panel.timings.x_res;
+        *yres = dssdev->panel.timings.y_res;
+}
+
+static ssize_t dsicm_num_errors_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *in = ddata->in;
+        u8 errors = 0;
+        int r;
+
+        mutex_lock(&ddata->lock);
+
+        if (ddata->enabled) {
+                in->ops.dsi->bus_lock(in);
+
+                r = dsicm_wake_up(ddata);
+                if (!r)
+                        r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
+                                        &errors);
+
+                in->ops.dsi->bus_unlock(in);
+        } else {
+                r = -ENODEV;
+        }
+
+        mutex_unlock(&ddata->lock);
+
+        if (r)
+                return r;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", errors);
+}
+
+static ssize_t dsicm_hw_revision_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *in = ddata->in;
+        u8 id1, id2, id3;
+        int r;
+
+        mutex_lock(&ddata->lock);
+
+        if (ddata->enabled) {
+                in->ops.dsi->bus_lock(in);
+
+                r = dsicm_wake_up(ddata);
+                if (!r)
+                        r = dsicm_get_id(ddata, &id1, &id2, &id3);
+
+                in->ops.dsi->bus_unlock(in);
+        } else {
+                r = -ENODEV;
+        }
+
+        mutex_unlock(&ddata->lock);
+
+        if (r)
+                return r;
+
+        return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
+}
+
+static ssize_t dsicm_store_ulps(struct device *dev,
+                struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *in = ddata->in;
+        unsigned long t;
+        int r;
+
+        r = kstrtoul(buf, 0, &t);
+        if (r)
+                return r;
+
+        mutex_lock(&ddata->lock);
+
+        if (ddata->enabled) {
+                in->ops.dsi->bus_lock(in);
+
+                if (t)
+                        r = dsicm_enter_ulps(ddata);
+                else
+                        r = dsicm_wake_up(ddata);
+
+                in->ops.dsi->bus_unlock(in);
+        }
+
+        mutex_unlock(&ddata->lock);
+
+        if (r)
+                return r;
+
+        return count;
+}
+
+static ssize_t dsicm_show_ulps(struct device *dev,
+                struct device_attribute *attr,
+                char *buf)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        unsigned t;
+
+        mutex_lock(&ddata->lock);
+        t = ddata->ulps_enabled;
+        mutex_unlock(&ddata->lock);
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", t);
+}
+
+static ssize_t dsicm_store_ulps_timeout(struct device *dev,
+                struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *in = ddata->in;
+        unsigned long t;
+        int r;
+
+        r = kstrtoul(buf, 0, &t);
+        if (r)
+                return r;
+
+        mutex_lock(&ddata->lock);
+        ddata->ulps_timeout = t;
+
+        if (ddata->enabled) {
+                /* dsicm_wake_up will restart the timer */
+                in->ops.dsi->bus_lock(in);
+                r = dsicm_wake_up(ddata);
+                in->ops.dsi->bus_unlock(in);
+        }
+
+        mutex_unlock(&ddata->lock);
+
+        if (r)
+                return r;
+
+        return count;
+}
+
+static ssize_t dsicm_show_ulps_timeout(struct device *dev,
+                struct device_attribute *attr,
+                char *buf)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        unsigned t;
+
+        mutex_lock(&ddata->lock);
+        t = ddata->ulps_timeout;
+        mutex_unlock(&ddata->lock);
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", t);
+}
+
+static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
+static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
+static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
+                dsicm_show_ulps, dsicm_store_ulps);
+static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
+                dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
+
+static struct attribute *dsicm_attrs[] = {
+        &dev_attr_num_dsi_errors.attr,
+        &dev_attr_hw_revision.attr,
+        &dev_attr_ulps.attr,
+        &dev_attr_ulps_timeout.attr,
+        NULL,
+};
+
+static struct attribute_group dsicm_attr_group = {
+        .attrs = dsicm_attrs,
+};
+
+static void dsicm_hw_reset(struct panel_drv_data *ddata)
+{
+        if (!gpio_is_valid(ddata->reset_gpio))
+                return;
+
+        gpio_set_value(ddata->reset_gpio, 1);
+        udelay(10);
+        /* reset the panel */
+        gpio_set_value(ddata->reset_gpio, 0);
+        /* assert reset */
+        udelay(10);
+        gpio_set_value(ddata->reset_gpio, 1);
+        /* wait after releasing reset */
+        usleep_range(5000, 10000);
+}
+
+static int dsicm_power_on(struct panel_drv_data *ddata)
+{
+        struct omap_dss_device *in = ddata->in;
+        u8 id1, id2, id3;
+        int r;
+        struct omap_dss_dsi_config dsi_config = {
+                .mode = OMAP_DSS_DSI_CMD_MODE,
+                .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
+                .timings = &ddata->timings,
+                .hs_clk_min = 150000000,
+                .hs_clk_max = 300000000,
+                .lp_clk_min = 7000000,
+                .lp_clk_max = 10000000,
+        };
+
+        r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
+        if (r) {
+                dev_err(&ddata->pdev->dev, "failed to configure DSI pins\n");
+                goto err0;
+        };
+
+        r = in->ops.dsi->set_config(in, &dsi_config);
+        if (r) {
+                dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
+                goto err0;
+        }
+
+        r = in->ops.dsi->enable(in);
+        if (r) {
+                dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
+                goto err0;
+        }
+
+        dsicm_hw_reset(ddata);
+
+        in->ops.dsi->enable_hs(in, ddata->channel, false);
+
+        r = dsicm_sleep_out(ddata);
+        if (r)
+                goto err;
+
+        r = dsicm_get_id(ddata, &id1, &id2, &id3);
+        if (r)
+                goto err;
+
+        r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
+        if (r)
+                goto err;
+
+        r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
+                        (1<<2) | (1<<5));       /* BL | BCTRL */
+        if (r)
+                goto err;
+
+        r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
+                MIPI_DCS_PIXEL_FMT_24BIT);
+        if (r)
+                goto err;
+
+        r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
+        if (r)
+                goto err;
+
+        r = _dsicm_enable_te(ddata, ddata->te_enabled);
+        if (r)
+                goto err;
+
+        r = in->ops.dsi->enable_video_output(in, ddata->channel);
+        if (r)
+                goto err;
+
+        ddata->enabled = 1;
+
+        if (!ddata->intro_printed) {
+                dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
+                        id1, id2, id3);
+                ddata->intro_printed = true;
+        }
+
+        in->ops.dsi->enable_hs(in, ddata->channel, true);
+
+        return 0;
+err:
+        dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
+
+        dsicm_hw_reset(ddata);
+
+        in->ops.dsi->disable(in, true, false);
+err0:
+        return r;
+}
+
+static void dsicm_power_off(struct panel_drv_data *ddata)
+{
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        in->ops.dsi->disable_video_output(in, ddata->channel);
+
+        r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
+        if (!r)
+                r = dsicm_sleep_in(ddata);
+
+        if (r) {
+                dev_err(&ddata->pdev->dev,
+                                "error disabling panel, issuing HW reset\n");
+                dsicm_hw_reset(ddata);
+        }
+
+        in->ops.dsi->disable(in, true, false);
+
+        ddata->enabled = 0;
+}
+
+static int dsicm_panel_reset(struct panel_drv_data *ddata)
+{
+        dev_err(&ddata->pdev->dev, "performing LCD reset\n");
+
+        dsicm_power_off(ddata);
+        dsicm_hw_reset(ddata);
+        return dsicm_power_on(ddata);
+}
+
+static int dsicm_connect(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        struct device *dev = &ddata->pdev->dev;
+        int r;
+
+        if (omapdss_device_is_connected(dssdev))
+                return 0;
+
+        r = in->ops.dsi->connect(in, dssdev);
+        if (r) {
+                dev_err(dev, "Failed to connect to video source\n");
+                return r;
+        }
+
+        r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
+        if (r) {
+                dev_err(dev, "failed to get virtual channel\n");
+                goto err_req_vc;
+        }
+
+        r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
+        if (r) {
+                dev_err(dev, "failed to set VC_ID\n");
+                goto err_vc_id;
+        }
+
+        return 0;
+
+err_vc_id:
+        in->ops.dsi->release_vc(ddata->in, ddata->channel);
+err_req_vc:
+        in->ops.dsi->disconnect(in, dssdev);
+        return r;
+}
+
+static void dsicm_disconnect(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        if (!omapdss_device_is_connected(dssdev))
+                return;
+
+        in->ops.dsi->release_vc(in, ddata->channel);
+        in->ops.dsi->disconnect(in, dssdev);
+}
+
+static int dsicm_enable(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        dev_dbg(&ddata->pdev->dev, "enable\n");
+
+        mutex_lock(&ddata->lock);
+
+        if (!omapdss_device_is_connected(dssdev)) {
+                r = -ENODEV;
+                goto err;
+        }
+
+        if (omapdss_device_is_enabled(dssdev)) {
+                r = 0;
+                goto err;
+        }
+
+        in->ops.dsi->bus_lock(in);
+
+        r = dsicm_power_on(ddata);
+
+        in->ops.dsi->bus_unlock(in);
+
+        if (r)
+                goto err;
+
+        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+        mutex_unlock(&ddata->lock);
+
+        return 0;
+err:
+        dev_dbg(&ddata->pdev->dev, "enable failed\n");
+        mutex_unlock(&ddata->lock);
+        return r;
+}
+
+static void dsicm_disable(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        dev_dbg(&ddata->pdev->dev, "disable\n");
+
+        mutex_lock(&ddata->lock);
+
+        dsicm_cancel_ulps_work(ddata);
+
+        in->ops.dsi->bus_lock(in);
+
+        if (omapdss_device_is_enabled(dssdev)) {
+                r = dsicm_wake_up(ddata);
+                if (!r)
+                        dsicm_power_off(ddata);
+        }
+
+        in->ops.dsi->bus_unlock(in);
+
+        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+
+        mutex_unlock(&ddata->lock);
+}
+
+static void dsicm_framedone_cb(int err, void *data)
+{
+        struct panel_drv_data *ddata = data;
+        struct omap_dss_device *in = ddata->in;
+
+        dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
+        in->ops.dsi->bus_unlock(ddata->in);
+}
+
+static irqreturn_t dsicm_te_isr(int irq, void *data)
+{
+        struct panel_drv_data *ddata = data;
+        struct omap_dss_device *in = ddata->in;
+        int old;
+        int r;
+
+        old = atomic_cmpxchg(&ddata->do_update, 1, 0);
+
+        if (old) {
+                cancel_delayed_work(&ddata->te_timeout_work);
+
+                r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
+                                ddata);
+                if (r)
+                        goto err;
+        }
+
+        return IRQ_HANDLED;
+err:
+        dev_err(&ddata->pdev->dev, "start update failed\n");
+        in->ops.dsi->bus_unlock(in);
+        return IRQ_HANDLED;
+}
+
+static void dsicm_te_timeout_work_callback(struct work_struct *work)
+{
+        struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
+                                        te_timeout_work.work);
+        struct omap_dss_device *in = ddata->in;
+
+        dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
+
+        atomic_set(&ddata->do_update, 0);
+        in->ops.dsi->bus_unlock(in);
+}
+
+static int dsicm_update(struct omap_dss_device *dssdev,
+                                    u16 x, u16 y, u16 w, u16 h)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
+
+        mutex_lock(&ddata->lock);
+        in->ops.dsi->bus_lock(in);
+
+        r = dsicm_wake_up(ddata);
+        if (r)
+                goto err;
+
+        if (!ddata->enabled) {
+                r = 0;
+                goto err;
+        }
+
+        /* XXX no need to send this every frame, but dsi break if not done */
+        r = dsicm_set_update_window(ddata, 0, 0,
+                        dssdev->panel.timings.x_res,
+                        dssdev->panel.timings.y_res);
+        if (r)
+                goto err;
+
+        if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
+                schedule_delayed_work(&ddata->te_timeout_work,
+                                msecs_to_jiffies(250));
+                atomic_set(&ddata->do_update, 1);
+        } else {
+                r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
+                                ddata);
+                if (r)
+                        goto err;
+        }
+
+        /* note: no bus_unlock here. unlock is in framedone_cb */
+        mutex_unlock(&ddata->lock);
+        return 0;
+err:
+        in->ops.dsi->bus_unlock(in);
+        mutex_unlock(&ddata->lock);
+        return r;
+}
+
+static int dsicm_sync(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        dev_dbg(&ddata->pdev->dev, "sync\n");
+
+        mutex_lock(&ddata->lock);
+        in->ops.dsi->bus_lock(in);
+        in->ops.dsi->bus_unlock(in);
+        mutex_unlock(&ddata->lock);
+
+        dev_dbg(&ddata->pdev->dev, "sync done\n");
+
+        return 0;
+}
+
+static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
+{
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        if (enable)
+                r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
+        else
+                r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
+
+        if (!gpio_is_valid(ddata->ext_te_gpio))
+                in->ops.dsi->enable_te(in, enable);
+
+        /* possible panel bug */
+        msleep(100);
+
+        return r;
+}
+
+static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        mutex_lock(&ddata->lock);
+
+        if (ddata->te_enabled == enable)
+                goto end;
+
+        in->ops.dsi->bus_lock(in);
+
+        if (ddata->enabled) {
+                r = dsicm_wake_up(ddata);
+                if (r)
+                        goto err;
+
+                r = _dsicm_enable_te(ddata, enable);
+                if (r)
+                        goto err;
+        }
+
+        ddata->te_enabled = enable;
+
+        in->ops.dsi->bus_unlock(in);
+end:
+        mutex_unlock(&ddata->lock);
+
+        return 0;
+err:
+        in->ops.dsi->bus_unlock(in);
+        mutex_unlock(&ddata->lock);
+
+        return r;
+}
+
+static int dsicm_get_te(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        int r;
+
+        mutex_lock(&ddata->lock);
+        r = ddata->te_enabled;
+        mutex_unlock(&ddata->lock);
+
+        return r;
+}
+
+static int dsicm_memory_read(struct omap_dss_device *dssdev,
+                void *buf, size_t size,
+                u16 x, u16 y, u16 w, u16 h)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+        int first = 1;
+        int plen;
+        unsigned buf_used = 0;
+
+        if (size < w * h * 3)
+                return -ENOMEM;
+
+        mutex_lock(&ddata->lock);
+
+        if (!ddata->enabled) {
+                r = -ENODEV;
+                goto err1;
+        }
+
+        size = min(w * h * 3,
+                        dssdev->panel.timings.x_res *
+                        dssdev->panel.timings.y_res * 3);
+
+        in->ops.dsi->bus_lock(in);
+
+        r = dsicm_wake_up(ddata);
+        if (r)
+                goto err2;
+
+        /* plen 1 or 2 goes into short packet. until checksum error is fixed,
+         * use short packets. plen 32 works, but bigger packets seem to cause
+         * an error. */
+        if (size % 2)
+                plen = 1;
+        else
+                plen = 2;
+
+        dsicm_set_update_window(ddata, x, y, w, h);
+
+        r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
+        if (r)
+                goto err2;
+
+        while (buf_used < size) {
+                u8 dcs_cmd = first ? 0x2e : 0x3e;
+                first = 0;
+
+                r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
+                                buf + buf_used, size - buf_used);
+
+                if (r < 0) {
+                        dev_err(dssdev->dev, "read error\n");
+                        goto err3;
+                }
+
+                buf_used += r;
+
+                if (r < plen) {
+                        dev_err(&ddata->pdev->dev, "short read\n");
+                        break;
+                }
+
+                if (signal_pending(current)) {
+                        dev_err(&ddata->pdev->dev, "signal pending, "
+                                        "aborting memory read\n");
+                        r = -ERESTARTSYS;
+                        goto err3;
+                }
+        }
+
+        r = buf_used;
+
+err3:
+        in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
+err2:
+        in->ops.dsi->bus_unlock(in);
+err1:
+        mutex_unlock(&ddata->lock);
+        return r;
+}
+
+static void dsicm_ulps_work(struct work_struct *work)
+{
+        struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
+                        ulps_work.work);
+        struct omap_dss_device *dssdev = &ddata->dssdev;
+        struct omap_dss_device *in = ddata->in;
+
+        mutex_lock(&ddata->lock);
+
+        if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
+                mutex_unlock(&ddata->lock);
+                return;
+        }
+
+        in->ops.dsi->bus_lock(in);
+
+        dsicm_enter_ulps(ddata);
+
+        in->ops.dsi->bus_unlock(in);
+        mutex_unlock(&ddata->lock);
+}
+
+static struct omap_dss_driver dsicm_ops = {
+        .connect        = dsicm_connect,
+        .disconnect     = dsicm_disconnect,
+
+        .enable         = dsicm_enable,
+        .disable        = dsicm_disable,
+
+        .update         = dsicm_update,
+        .sync           = dsicm_sync,
+
+        .get_resolution = dsicm_get_resolution,
+        .get_recommended_bpp = omapdss_default_get_recommended_bpp,
+
+        .enable_te      = dsicm_enable_te,
+        .get_te         = dsicm_get_te,
+
+        .memory_read    = dsicm_memory_read,
+};
+
+static int dsicm_probe_pdata(struct platform_device *pdev)
+{
+        const struct panel_dsicm_platform_data *pdata;
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *dssdev, *in;
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        in = omap_dss_find_output(pdata->source);
+        if (in == NULL) {
+                dev_err(&pdev->dev, "failed to find video source\n");
+                return -EPROBE_DEFER;
+        }
+        ddata->in = in;
+
+        ddata->reset_gpio = pdata->reset_gpio;
+
+        if (pdata->use_ext_te)
+                ddata->ext_te_gpio = pdata->ext_te_gpio;
+        else
+                ddata->ext_te_gpio = -1;
+
+        ddata->ulps_timeout = pdata->ulps_timeout;
+
+        ddata->use_dsi_backlight = pdata->use_dsi_backlight;
+
+        ddata->pin_config = pdata->pin_config;
+
+        dssdev = &ddata->dssdev;
+        dssdev->name = pdata->name;
+
+        return 0;
+}
+
+static int dsicm_probe(struct platform_device *pdev)
+{
+        struct backlight_properties props;
+        struct panel_drv_data *ddata;
+        struct backlight_device *bldev = NULL;
+        struct device *dev = &pdev->dev;
+        struct omap_dss_device *dssdev;
+        int r;
+
+        dev_dbg(dev, "probe\n");
+
+        ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
+        if (!ddata)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, ddata);
+        ddata->pdev = pdev;
+
+        if (dev_get_platdata(dev)) {
+                r = dsicm_probe_pdata(pdev);
+                if (r)
+                        return r;
+        } else {
+                return -ENODEV;
+        }
+
+        ddata->timings.x_res = 864;
+        ddata->timings.y_res = 480;
+        ddata->timings.pixel_clock = DIV_ROUND_UP(864 * 480 * 60, 1000);
+
+        dssdev = &ddata->dssdev;
+        dssdev->dev = dev;
+        dssdev->driver = &dsicm_ops;
+        dssdev->panel.timings = ddata->timings;
+        dssdev->type = OMAP_DISPLAY_TYPE_DSI;
+        dssdev->owner = THIS_MODULE;
+
+        dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
+        dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
+                OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
+
+        r = omapdss_register_display(dssdev);
+        if (r) {
+                dev_err(dev, "Failed to register panel\n");
+                goto err_reg;
+        }
+
+        mutex_init(&ddata->lock);
+
+        atomic_set(&ddata->do_update, 0);
+
+        if (gpio_is_valid(ddata->reset_gpio)) {
+                r = devm_gpio_request_one(dev, ddata->reset_gpio,
+                                GPIOF_OUT_INIT_LOW, "taal rst");
+                if (r) {
+                        dev_err(dev, "failed to request reset gpio\n");
+                        return r;
+                }
+        }
+
+        if (gpio_is_valid(ddata->ext_te_gpio)) {
+                r = devm_gpio_request_one(dev, ddata->ext_te_gpio,
+                                GPIOF_IN, "taal irq");
+                if (r) {
+                        dev_err(dev, "GPIO request failed\n");
+                        return r;
+                }
+
+                r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
+                                dsicm_te_isr,
+                                IRQF_TRIGGER_RISING,
+                                "taal vsync", ddata);
+
+                if (r) {
+                        dev_err(dev, "IRQ request failed\n");
+                        return r;
+                }
+
+                INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
+                                        dsicm_te_timeout_work_callback);
+
+                dev_dbg(dev, "Using GPIO TE\n");
+        }
+
+        ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
+        if (ddata->workqueue == NULL) {
+                dev_err(dev, "can't create workqueue\n");
+                return -ENOMEM;
+        }
+        INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
+
+        dsicm_hw_reset(ddata);
+
+        if (ddata->use_dsi_backlight) {
+                memset(&props, 0, sizeof(struct backlight_properties));
+                props.max_brightness = 255;
+
+                props.type = BACKLIGHT_RAW;
+                bldev = backlight_device_register(dev_name(dev),
+                                dev, ddata, &dsicm_bl_ops, &props);
+                if (IS_ERR(bldev)) {
+                        r = PTR_ERR(bldev);
+                        goto err_bl;
+                }
+
+                ddata->bldev = bldev;
+
+                bldev->props.fb_blank = FB_BLANK_UNBLANK;
+                bldev->props.power = FB_BLANK_UNBLANK;
+                bldev->props.brightness = 255;
+
+                dsicm_bl_update_status(bldev);
+        }
+
+        r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
+        if (r) {
+                dev_err(dev, "failed to create sysfs files\n");
+                goto err_sysfs_create;
+        }
+
+        return 0;
+
+err_sysfs_create:
+        if (bldev != NULL)
+                backlight_device_unregister(bldev);
+err_bl:
+        destroy_workqueue(ddata->workqueue);
+err_reg:
+        return r;
+}
+
+static int __exit dsicm_remove(struct platform_device *pdev)
+{
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct omap_dss_device *dssdev = &ddata->dssdev;
+        struct backlight_device *bldev;
+
+        dev_dbg(&pdev->dev, "remove\n");
+
+        omapdss_unregister_display(dssdev);
+
+        dsicm_disable(dssdev);
+        dsicm_disconnect(dssdev);
+
+        sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
+
+        bldev = ddata->bldev;
+        if (bldev != NULL) {
+                bldev->props.power = FB_BLANK_POWERDOWN;
+                dsicm_bl_update_status(bldev);
+                backlight_device_unregister(bldev);
+        }
+
+        omap_dss_put_device(ddata->in);
+
+        dsicm_cancel_ulps_work(ddata);
+        destroy_workqueue(ddata->workqueue);
+
+        /* reset, to be sure that the panel is in a valid state */
+        dsicm_hw_reset(ddata);
+
+        return 0;
+}
+
+static struct platform_driver dsicm_driver = {
+        .probe = dsicm_probe,
+        .remove = __exit_p(dsicm_remove),
+        .driver = {
+                .name = "panel-dsi-cm",
+                .owner = THIS_MODULE,
+        },
+};
+
+module_platform_driver(dsicm_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
+MODULE_LICENSE("GPL");